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      1 /*
      2  * Copyright (C) 2013 Google, Inc.
      3  *
      4  * This library is free software; you can redistribute it and/or
      5  * modify it under the terms of the GNU Library General Public
      6  * License as published by the Free Software Foundation; either
      7  * version 2 of the License, or (at your option) any later version.
      8  *
      9  * This library is distributed in the hope that it will be useful,
     10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     12  * Library General Public License for more details.
     13  *
     14  * You should have received a copy of the GNU Library General Public License
     15  * along with this library; see the file COPYING.LIB.  If not, write to
     16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     17  * Boston, MA 02110-1301, USA.
     18  *
     19  */
     20 
     21 #ifndef CSSCustomFontData_h
     22 #define CSSCustomFontData_h
     23 
     24 #include "core/css/CSSFontFaceSource.h"
     25 #include "platform/fonts/CustomFontData.h"
     26 
     27 namespace blink {
     28 
     29 class CSSCustomFontData FINAL : public CustomFontData {
     30 public:
     31     enum FallbackVisibility { InvisibleFallback, VisibleFallback };
     32 
     33     static PassRefPtr<CSSCustomFontData> create(RemoteFontFaceSource* source, FallbackVisibility visibility)
     34     {
     35         return adoptRef(new CSSCustomFontData(source, visibility));
     36     }
     37 
     38     virtual ~CSSCustomFontData() { }
     39 
     40     virtual bool shouldSkipDrawing() const OVERRIDE
     41     {
     42         if (m_fontFaceSource)
     43             m_fontFaceSource->paintRequested();
     44         return m_fallbackVisibility == InvisibleFallback && m_isLoading;
     45     }
     46 
     47     virtual void beginLoadIfNeeded() const OVERRIDE
     48     {
     49         if (!m_isLoading && m_fontFaceSource) {
     50             m_isLoading = true;
     51             m_fontFaceSource->beginLoadIfNeeded();
     52         }
     53     }
     54 
     55     virtual bool isLoading() const OVERRIDE { return m_isLoading; }
     56     virtual bool isLoadingFallback() const OVERRIDE { return true; }
     57     virtual void clearFontFaceSource() OVERRIDE { m_fontFaceSource = 0; }
     58 
     59 private:
     60     CSSCustomFontData(RemoteFontFaceSource* source, FallbackVisibility visibility)
     61         : m_fontFaceSource(source)
     62         , m_fallbackVisibility(visibility)
     63         , m_isLoading(false)
     64     {
     65         if (source)
     66             m_isLoading = source->isLoading();
     67     }
     68 
     69     RemoteFontFaceSource* m_fontFaceSource;
     70     FallbackVisibility m_fallbackVisibility;
     71     mutable bool m_isLoading;
     72 };
     73 
     74 }
     75 
     76 #endif // CSSCustomFontData_h
     77